JP6248555B2 - Vehicle seat device - Google Patents

Description

  The present invention relates to a vehicle seat device having a function of detecting the weight of an occupant.

  Conventionally, automobiles are provided with seat belts and airbags as equipment for ensuring the safety of passengers. Recently, in order to further improve the performance of seat belts and airbags, it is possible to adjust the amount and speed of deployment of airbags by determining whether they are adults or children according to the weight of the occupant, Is adjusted. Thus, it is extremely important in terms of safety of the vehicle occupant to detect and correctly determine the occupant's weight.

  As a device for detecting the weight of a vehicle occupant, load sensors (load cells) are placed at the four corners of the seat frame, and the weight in the vertical direction applied to each load sensor is totaled to measure the occupant weight. It is generally done.

  However, the load sensor consists of a strain gauge attached to a strain generating body that bends when a load is applied, and a voltage that changes in accordance with the amount of change in resistance value caused by the deformation of the strain generating body according to the load. Output a signal. This strain body is designed to have a strength that can measure the weight of a passenger with high sensitivity. Therefore, if a large impact is applied to the vehicle due to a collision or the like, an excessive load is applied to the strain body and the strain body deforms abnormally. Sometimes. In this case, the detection standard of the load sensor is shifted, and it may be impossible to accurately measure the weight of the occupant.

  As an apparatus therefor, Patent Document 1 discloses a load detection means for detecting a load based on the weight of the occupant and acceleration applied to the occupant and the seat due to a collision, etc., and an occupant weight load detection in which the load detection means is preset. There is described an occupant weight measuring device provided with an abnormal load detecting means for outputting an abnormal load signal when an abnormal load outside the range is detected. As a result, even when a low-speed collision occurs, an abnormal load can be reliably detected when an abnormal load is applied to the strain body of the load detection device due to the weight of the passenger. .

  Patent Document 2 discloses a vehicle in which a load detection unit detects a compressive load greater than a set value in a peripheral portion of a vehicle seat and then detects a tensile direction load greater than a set value within a set time. Describes a vehicle impact determination device that determines that an impact has been applied. When an impact due to a collision or the like is applied to the vehicle, the collision or the like is determined based on a phenomenon in which a compressive load and a tensile load appear continuously within a predetermined time in the periphery of the seat portion of the vehicle seat. When it is determined that the vehicle is in a collision or the like, the vehicle has an impact notification means for informing the vehicle occupant that an impact has been applied to the vehicle. Thus, the occupant weight measuring device of Patent Document 1 and the vehicle impact determination device of Patent Document 2 are used when the load detecting device may detect an inaccurate numerical value due to a vehicle collision. It is intended to prevent malfunctions of related devices that are linked based on inaccurate detection.

Japanese Patent No. 4267836 JP 2011-43454 A

  However, as a European practice, in order to secure a parking space during parallel parking, there are cases where the vehicle is parked by repeatedly colliding with a vehicle stopped in the front-rear direction. In such a case, it is often a light collision that does not affect the occupant discrimination performance of the load sensor.

  In such a case, in Patent Document 1 and Patent Document 2, a collision message is detected and a warning message (collision effect warning) is displayed, and the frequency at which the vehicle is inspected by a dealer or a maintenance shop due to this warning message. There was concern that it would increase.

  The present invention has been made in view of the conventional problems. When the load detection device detects a collision load due to a collision of the vehicle, the deviation amount from the zero point of the load detection device is corrected. The present invention provides a vehicle seat device that reduces the frequency of vehicle inspection.

In order to solve the above problems, the structural features of the invention according to claim 1 are a vehicle seat, a mounting member provided on a vehicle floor, and a seat side fixing member that fixes the vehicle seat to the mounting member. And the load acting on the vehicle seat and the collision of the vehicle to determine the presence / absence / type of an occupant and to determine the influence of the collision of the vehicle. in the detection value between the load detection device for measuring the detected the collision load value, the collision load value the load detection device is detect is a preset first impact load value and the second collision load value In some cases, the amount of deviation from the zero point due to the collision of the load detection device caused by the collision of the vehicle is added to the value stored as the amount of deviation from the zero point of the load detection device before the collision. Detection device A zero-point deviation amount detection unit stored as a deviation amount from a point and a load detected by the load detection device based on a deviation amount from the zero point of the load detection device stored in the zero-point deviation amount detection unit. A zero-point deviation amount correction unit that corrects the absolute value of the first collision load value and the second collision load value to detect a collision that cannot be corrected by the deviation amount from the zero point. It is set to a value smaller than the absolute value of the value .

  According to this, when the collision load value due to the collision of the vehicle is detected, the deviation amount from the zero point due to the collision that causes an error in the detected load value of the load detection device due to the collision is obtained. The amount of deviation is added to the value stored as the amount of deviation from the zero point of the load detection device before the collision and stored as the amount of deviation from the zero point of the load detection device. Based on the deviation from the zero point, the load value detected by the load detection device is corrected.

  Thus, when the collision load is detected, the zero point deviation amount of the load detection device due to the collision is obtained, and the deviation amount from the zero point of the load detection device due to the collision is calculated as the deviation from the zero point of the load detection device before the collision. Replace by adding to the value stored as a quantity. And since the load value which a load detection apparatus detects based on the deviation | shift amount from 0 point of the replaced load detection apparatus is corrected, the high detection accuracy of a load detection apparatus can be maintained easily. Further, it is possible to eliminate the trouble of frequently requesting a vehicle inspection for maintaining the detection accuracy to a dealer or a maintenance shop at every collision.

Structural feature of the invention according to claim 2, wherein the impact load value the load detecting device detects the collision of the vehicle, the release direction with the mounting member and the seat-side fixing member is a direction away The vehicle seat device according to claim 1, wherein the vehicle seat device is a load.

  The occupant's load detected by the load detection device is detected by a load in the compression direction, which is a direction in which the mounting member and the seat-side fixing member approach each other. Therefore, by detecting the collision load with the load in the peeling direction opposite to the direction in which the passenger's load is detected, the collision load value appears prominently and can be detected easily and reliably.

  According to a third aspect of the present invention, there is provided a correspondence storage unit that preliminarily obtains and stores a relationship of a deviation amount from the zero point due to the collision with respect to the collision load value of the load detection device at the time of the collision of the vehicle. The zero-point deviation amount detection unit further includes a deviation from the zero point due to the collision of the load detection device based on a relation of a deviation amount from the zero point due to the collision with respect to the collision load value stored in the correspondence relationship storage unit. It is set as the vehicle seat apparatus of Claim 1 or 2 which detects quantity.

  According to this, since the deviation amount from the zero point due to the collision of the load detection device is detected from the relationship between the collision load stored in the correspondence relationship storage unit and the deviation amount from the zero point, the deviation from the zero point due to the collision is detected. The load value detected by the load detector can be quickly corrected by obtaining the amount easily and quickly.

  A structural feature of the invention according to claim 4 is that the vehicle seat includes a vacant seat determination unit that determines whether the vehicle seat is in a vacant seat state where no occupant is seated or an object is placed, and the zero-point deviation amount detection unit 4. The load value detected by the load detection device when the vacant seat determination unit determines that the vehicle seat is in a vacant seat state is stored as a deviation amount from 0 point of the load detection device. This is a vehicle seat device.

  According to this, when it is determined that the vacant seat determination unit is in the vacant seat state, the zero point deviation amount detection unit stores the deviation amount data from the zero point of the load detection device before the collision that has already been stored, It is replaced with the load value detected by the load detection device in the vacant seat state and stored as a deviation amount from the zero point of the load detection device.

  In this way, the deviation amount from the zero point of the load detection device based on the load value detected by the load detection device when the seat is actually empty is used as the deviation amount from the zero point of the load detection device before the collision that has already been stored. Replaced with data (including the deviation from the zero point of the load detection device obtained from the correspondence between the collision load and the zero point deviation before the collision), and based on the deviation from the zero point of the replaced load detection device Since the load value detected by the load detection device is corrected, accurate occupant determination can be performed based on the load value detected by the load detection device even after a collision.

  The structural feature of the invention according to claim 5 further includes a vehicle stop determination unit that determines that the vehicle is in a stopped state, and the zero point deviation amount detection unit is configured such that the vehicle stop determination unit is connected to the vehicle. The vehicle seat device according to claim 4, wherein the load value detected by the load detection device when it is determined that the vehicle is in a stopped state is stored as a deviation amount from a zero point of the load detection device. .

  According to this, when the vehicle stop determination unit determines that the vehicle is in a stopped state, the zero point deviation amount detection unit uses the load value detected by the load detection device as the deviation amount from the zero point of the load detection device. Therefore, it is possible to detect the amount of deviation from the zero point of the load detection device while eliminating disturbances associated with vehicle travel that affects the detection accuracy of the amount of deviation from the zero point. In this way, the load value detected by the load detection device is corrected based on the deviation from the zero point of the load detection device that is accurately detected excluding the disturbance, so the load value detected by the load detection device even after the collision. Based on the above, highly accurate occupant determination can be performed.

  The structural feature of the invention according to claim 6 is further provided with a tilt angle detection device that detects a tilt angle of the vehicle when the vehicle is in a stopped state, and the zero point deviation amount detection unit includes the tilt angle. The vehicle seat device according to claim 5, wherein a shift amount from the zero point of the load detection device is stored in accordance with an inclination angle of the vehicle detected by a detection device.

  A vehicle that is determined to be vacant may stop on an inclined ground surface. For example, when the load detection device is arranged in the front and rear inside the vehicle seat (the front and rear on the right side in the left seat), if the vehicle is tilted so that the right side of the vehicle is downward, the detection value of the load detection device is It becomes larger compared to flat land without slope, and smaller in the opposite case. Since the amount of deviation from the zero point of the load detection device is also obtained from the load value detected by the load detection device in the empty seat state, it is affected by the inclination of the ground of the vehicle that stops in the empty seat state.

  Therefore, the inclination angle detection device detects the inclination angle of the inclined ground on which the vehicle is stopped, and the zero point deviation detection unit detects the load value detected by the load detection device on the inclination of the ground on which the vehicle is stopped. It is stored as the amount of deviation from the zero point of the load detection device corresponding to the angle. As described above, even in a vehicle stopped on the ground on which the vehicle is inclined, the load detection device accurately detects the deviation from the zero point corresponding to the inclination angle of the ground on which the vehicle is stopped. Since the load value detected by the load detection device is corrected based on the amount of deviation of the load detection device from the zero point, highly accurate occupant determination can be performed based on the load value detected by the load detection device.

It is a figure which shows embodiment which has arrange | positioned the vehicle seat apparatus which concerns on this invention to the vehicle seat. It is a figure which shows the mounting state of a seatbelt in the vehicle seat apparatus. It is a block diagram which shows the outline | summary of a control system. It is a graph showing the relationship of 0 point | piece deviation | shift amount after a collision corresponding to the collision load value for every load sensor. It is a graph showing the relationship of the deviation | shift amount from 0 point corresponding to a total collision load value. It is a graph which shows the example of detection of the collision load by a load detection apparatus. It is a map which shows the relationship between the deviation | shift amount from 0 point of the load detection apparatus corresponding to the inclination angle of a vehicle, and an inclination angle. It is a graph which shows the example in which the big collision load value was detected. It is a flowchart which shows the procedure which calculates | requires the deviation | shift amount from 0 point of the load detection apparatus at the time of detecting a collision load value.

(Example)
Hereinafter, a first embodiment of a load detection device 10 that detects a load of an occupant seated on a vehicle seat of the vehicle seat device 100 according to the present invention will be described with reference to the drawings. In addition, the directions of “front and rear, left and right, and up and down” used in this specification are described with reference to each direction of the vehicle viewed from the occupant seated on the vehicle seat 11. In the present embodiment, the vehicle is a left-hand drive vehicle, and the presence / absence of a passenger seated in the passenger seat is determined.

  As shown in FIG. 1, a vehicle seat 11 for a passenger seat includes a seat cushion 11 on which an occupant is seated, and a seat that is attached to the rear end portion of the seat cushion 11 so as to be pivotable in the front-rear direction and serves as a backrest for the occupant. And a back 12. A headrest 13 that supports the head of the occupant is attached to the upper end of the seat back 12.

  The seat cushion 11 is formed by a seat frame 111 (seat-side fixing member), a pad member 112 disposed above the seat frame 111, and a skin 113 that covers the surface of the pad member 112. A pair of left and right upper rails (attachment members) 14R and 14L are attached to the lower surface of the seat frame 111. The upper rails 14R and 14L are engaged with a pair of lower rails (mounting members) 41R and 41L fixed on the vehicle floor 40 so as to be movable in the front-rear direction. Thereby, the vehicle seat 11 can move in the front-rear direction on the vehicle floor 40 and can be fixed at a position desired by the occupant.

  Next, the load detection device 10 will be described. As shown in FIG. 3, the load detection device 10 includes a front load sensor 21 </ b> F and a rear load sensor 21 </ b> R, and an amplifier unit 22 that amplifies the detected strain value.

  As shown in FIG. 1, the front and rear load sensors 21F and 21R are arranged at a predetermined distance between the seat frame (seat side fixing member) 111 and the left side (vehicle center side) upper rail (mounting member) 14L. It is placed in isolation. The front load sensor 21 </ b> F is provided in the front part of the front and rear center of the seat cushion 11, and the rear load sensor 21 </ b> R is provided in the rear part of the front and rear center of the seat cushion 11.

  As these load sensors 21L and 21R, for example, known load sensors described in Japanese Patent Application Laid-Open No. 2008-134225 are applied.

  The front load sensor 21F is interposed between the front portion of the seat frame (seat side fixing member) 111 and the left upper rail (mounting member) 14L, and detects the front load value Ff that the front left portion of the seat cushion 11 takes on. To do. Similarly, the rear load sensor 21R is interposed between the rear portion of the seat frame 111 and the left upper rail 14L and in the vicinity of the buckle 64 (see FIG. 2) supported by the vehicle seat 11, The rear load value Rf that the rear left portion of the seat cushion 11 is responsible for is detected.

  The front and rear load sensors 21F and 21R output a positive detection signal when a downward load is applied to the seat cushion 11 due to the seating of an occupant on the vehicle seat 11 and the like. When a direction load is applied, a negative detection signal is output. Note that the load values Ff and Rf of the front and rear load sensors 21F and 21R are both adjusted by 0 in the vehicle shipment state.

  As shown in FIG. 3, the load detection device 10 is connected to a control device 30, and an indicator (collision effect warning device) 52 or the like is connected to the control device 30 as an output unit.

The control device 30 includes an A / D converter (not shown) that digitally converts analog detection signals from the front and rear load sensors 21F and 21R, a storage unit 46 that stores data, and front and rear load sensors 21F and 21R. A detection signal from the vehicle, a detection signal from the G sensor 43, a detection signal from the vehicle speed sensor and the buckle switch 65 are input via the storage unit 46, a determination unit 45 that performs occupant determination, an input unit, And a control unit 47 that controls the output unit and the calculation unit 44. The calculation unit 44 calculates a vehicle inclination calculation unit 49 that calculates the horizontal inclination of the vehicle M based on the detection signal from the G sensor 43, and a zero point deviation amount that performs zero point correction from the obtained zero point deviation amount after the collision. A correction unit 51 is provided.
The G sensor 43 constitutes an inclination angle detection device.

  The determination unit 45 determines whether there is an occupant based on the front-rear sum load value (Ff + Rf) obtained by adding the front load value Ff detected by the front load sensor 21F and the rear load value Rf detected by the rear load sensor 21R. Whether the vehicle is in a stopped state based on detection signals from the occupant determination unit 48 that determines the type, the vacant seat determination unit 53 that determines the vacant seat state where no occupant is seated and no object is placed, and the vehicle speed sensor 56 The vehicle stop determination part 50 which determines these is provided.

  As shown in FIG. 3, the storage unit 46 indicates a relationship between the zero point deviation amount storage unit 54 that stores deviation amount data from the zero point before the collision, and the relationship between the collision load value and the zero point deviation amount after the collision. A correspondence relationship storage unit 58 is provided. The calculation unit 44 and the zero point deviation amount storage unit 54 constitute a zero point deviation amount detection unit.

  The control device 30 receives signals from the load detection device 10 and the seat belt wearing detection unit (buckle switch) 65, and performs various determination processes (to be described later) by the occupant determination unit 48. The passenger is determined to be “adult” or “child”, and the control unit 47 controls the airbag display lamp (indicator 52) and the like.

  As shown in FIG. 2 when the vehicle seat device 100 is viewed from the front, the seat belt device (seat belt) 60 includes a shoulder strap 61 and a lap strap 62 that are connected to each other by a tongue plate 63, and a tongue plate 63. And a buckle 64 that forms a buckle switch 65 by being attached and detached.

  A retractor (winding device) is disposed in a pillar (not shown) located on the right side of the vehicle seat device 100. The upper end of the shoulder strap 61 is connected to a retractor, and the shoulder strap 61 can be pulled out against the winding force of the retractor.

  On the other hand, the other end of the lap strap 62 is fixed to the vehicle floor 40 on the right side of the vehicle seat device 100. The buckle 64 is supported on the left rear side of the vehicle seat device 100, and an opening hole for inserting a tongue plate 63 described later is opened upward. The tongue plate 63 connected to the shoulder strap 61 and the lap strap 62 is inserted through the opening hole of the buckle 64 and is engaged and fixed.

  Thus, by arranging the buckle 64 on the same side as the side on which the front and rear load sensors 21F and 21R are arranged, the load detection device 10 can be used not only for the weight of the passenger sitting on the vehicle seat 11, but also for the seat. It is also possible to detect a downward load applied to the buckle 64 when the belt device 60 is worn and an upward load caused by pulling the seat belt when the seat belt device 60 is worn.

  Next, a flow chart shown in FIG. 9 shows a procedure for correcting the zero point deviation amount of the load detection device 10 when a collision of the vehicle M in the vehicle seat device configured as described above is detected by the load detection device 10. This will be described below.

  For example, when the vehicle collides forward, as shown in FIG. 6, the load sensor 21 </ b> R disposed behind the vehicle seat (seat cushion) 11 detects the collision load in the peeling direction (detected by a negative value). If it is (S100), the process proceeds to step 101, and the control device 30 determines whether or not the detected collision load value is larger than a predetermined first collision load value Lth1 (S101). (Because a plus or minus sign is given depending on the direction in which the load is generated, the magnitude is basically determined based on the absolute value. The same applies hereinafter.) In the case of a collision in front of the vehicle M as described above, A negative load in the separation direction is detected as a collision load by the rear load sensor 21R, and when a collision occurs behind the vehicle M, a negative load in the separation direction is detected as a collision load by the front load sensor 21F. The data of the predetermined first collision load value Lth1 is stored in advance in the storage unit 46 of the control device 30 as a threshold value of the collision load value that may affect the occupant determination performance of the load detection device 10. In the case of a collision in which a load smaller than a predetermined first collision load value Lth1 is detected, it is ignored because the zero point deviation amount of the load detection device 10 is not affected. In this embodiment, as shown in FIG. 6, for example, a collision load of Lra is detected.

  In the present embodiment, since the control device 30 determines that the detected collision load is larger than the predetermined collision load value Lth1, the process proceeds to step 102. If it is determined that the value is smaller than the predetermined collision load value, the process returns to step 100 and waits until the next collision load is detected.

  In step 102, the control device 30 determines whether or not the detected collision load value is smaller than the second collision load value Lth2. For example, as shown in FIG. 8, when the detected collision load value is larger than the second collision load value Lth2, a warning is displayed immediately by the indicator 52 or the like. Since it is considered that the collision is impossible due to the zero point deviation amount, the control procedure for the zero point correction is taken out, the influence of the collision is warned by the indicator 52 and the like, and the occupant is urged to perform early vehicle inspection.

  If the controller 30 determines in step 102 that the detected collision load value is smaller than the second collision load value Lth2, the process proceeds to step 103.

In step 103, the control device 30 stores the collision load value and the zero point of the load detection device 10 corresponding to the collision load value, for example, as shown in FIGS. The amount of deviation from the zero point due to the collision of the load detection device 10 is detected from the map showing the relationship of the amount of deviation. When the first collision load value Lth1 is detected by the rear load sensor 21R, the front load sensor 21F detects the collision load value (compression load) Lf1, and the rear load sensor 21R detects the second collision load value Lth2. When this is done, it is stored in advance that the front load sensor 21F detects the collision load value (compression load) Lf1.

  For example, in FIG. 4, when the rear load sensor 21R detects the collision load value Lra, the front load sensor 21F detects the collision load value Lfa. Therefore, the total collision load value Lsum (= Lra + Lfa) of the rear load sensor 21R and the front load sensor 21F is detected. And the deviation | shift amount from 0 point by the collision of the load detection apparatus 10 detects Wra in the rear load sensor 21R, and Wfa in the front load sensor 21F, respectively.

FIG. 5 shows the total value of the collision loads detected by the rear load sensor 21R and the front load sensor 21F. For example, the total collision load value Lsum which is a negative value as the total value of the rear load sensor 21R and the front load sensor 21F. When detected, a deviation amount Wsum (= Wra + Wfa) from 0 point due to the collision of the load detection device 10 is detected. In this example, a negative shift amount Wsum is detected.

  Next, the routine proceeds to step 104 where the deviation amount Wsum from the zero point due to the collision of the load detection device 10 detected by the correspondence relationship is set to the zero point of the load detection device 10 before the collision at the vehicle inclination angle 0 degree in FIG. The amount of deviation from the zero point of the load detection device 10 is obtained by adding to the amount of deviation Zf0 from the load, and based on this, the load detection device 10 is corrected by zero (temporary zero point correction), and then detected. The load value is detected based on the corrected value.

  4 and 5, the map of the relationship between the collision load value and the deviation amount from the zero point of the load detection device 10 corresponding to the collision load value does not consider the inclination angle of the vehicle M. It is set to 0 degrees.

  In addition, when the collision is repeated a plurality of times, for each collision, a map of the relationship between the collision load value and the deviation amount from the zero point of the load detection device 10 corresponding to the collision load value is used. The amount of deviation from the zero point of the load detection device 10 may be obtained by obtaining the amount of deviation, and accumulating this amount and adding it to the amount of deviation from the zero point of the load detection device 10 before the collision.

  Next, in step 105, the control device 30 determines whether or not the vehicle M is stopped based on, for example, a detection signal from the vehicle speed sensor 56. If it is determined that the vehicle has not stopped, the process returns to step 105 to repeat the determination as to whether or not the vehicle M has stopped.

  When it is determined that the vehicle M is stopped, the process proceeds to step 106, and it is determined whether or not the occupant is getting off. Whether the occupant gets out of the vehicle is determined, for example, by the fact that the buckle switch 65 is turned off, or that the load detected by the load detection device 10 continues for a predetermined time and is below a predetermined threshold. If it is determined that the occupant is not getting off, the process returns to step 105 and the procedure is repeated from the determination of whether or not the vehicle is stopped. When it is determined that the occupant is getting off, the routine proceeds to step 107, and the load value detected by the load detection device 10 when the seat is empty and the vehicle M is stopped is stored in the zero-point deviation amount storage unit 54 (this stored information). The load value is used to determine the amount of deviation from the zero point of the load detection device 10 according to the inclination angle when the vehicle inclination angle described later is obtained (S107).

  Subsequently, the process proceeds to step 108, and the inclination angle information of the stop position of the vehicle M is obtained from the G sensor 43. As shown in FIG. 1, when the front and rear load sensors 21F and 21R are interposed in the front and rear of the left side of the vehicle seat 11, as shown in FIG. When the vehicle tilts in such a manner, the load values detected by the front and rear load sensors 21F and 21R become small. When the vehicle M tilts so that the left side of the vehicle M becomes low, the load value detected becomes large. Therefore, as shown in FIG. 7, in the state before the collision in advance, data such as the deviation amounts Zf0, Zf7 from the zero point of the load detecting device 10 at the time of the vacant seat before the collision according to the inclination angle of the vehicle M at the time of the vacant seat. Is stored in the 0-point deviation amount storage unit (0-point deviation amount detection unit) 54 as a map.

Further, the amount of deviation from the zero point of the load detection device 10 at the time of vacant seat before collision according to the inclination angle of the vehicle M stored in advance is detected by the front load sensor 21F and the rear load sensor 21R at the time of vacant seat. It is expressed by the total value (Ff + Rf), and the detected load (difference from 0 kg) including the seat cushion 11, the seat back 12 and the frame as the vehicle seat is from the zero point of the load detecting device 10 when the seat is empty. It becomes the amount of deviation.
In the present embodiment, the amount of deviation Zs from the zero point due to the collision does not include the seat cushion 11, the seat back 12, the frame, and the like at the time of empty seat after the collision.

  Next, the process proceeds to step 109, and the zero point deviation amount of the load detection device 10 corresponding to the inclination angle of the vehicle M is obtained. Deviation amounts Zf0 and Zf7 from the zero point of the load detection device 10 at the time of vacant seat before the collision stored in the zero point deviation amount storage unit 54 with respect to the inclination angle of the vehicle M, and the vacant seat after the collision with respect to the inclination angle of the vehicle M Since the ratio of the influence of the inclination angle of the vehicle M on the detection value of the load detection device 10 is the same, the deviation amount Zk from the zero point of the load detection device 10 is expressed in parallel as shown in FIG. Therefore, for example, when the vehicle M has an inclination angle of 7 degrees, the load by the load detecting device 10 at the time of a collision empty seat (since this load value has already been detected in step 107, the vehicle inclination angle in steps 108 and 109 Is detected as a deviation amount Zk7 from the zero point of the load detection device 10), the load detection device 10 at the time of vacant seat at another inclination angle of the vehicle M is detected. The shift amount Zk (including Zk7) from the zero point can be obtained.

  Next, the routine proceeds to step 110, where the amount of deviation Zf from the zero point of the load detection device 10 in the vacant seat before the collision is replaced with the amount of deviation of the zero point of the load detection device 10 according to the inclination angle of the vehicle M. In this embodiment, from the zero point of the load detection device 10 based on the deviation amount Wsum from the zero point due to the collision, which is obtained from the correspondence between the collision load detected in steps 103 and 104 and the deviation amount from the zero point due to the collision. The amount of deviation (Zf0 + Wsum) is canceled and replaced with the amount of deviation Zk from the zero point of the load detection device 10 corresponding to the inclination angle when the seat is empty after the collision, and stored in the zero point deviation amount storage unit 54.

  Next, the process proceeds to step 111, where the load detection device 10 is corrected to zero by the amount of deviation Zk from the zero point of the load detection device 10 according to the tilt angle when the seat is empty after the collision, and then the detected load is corrected. Obtained based on the zero point deviation amount.

  In this way, the deviation amount Zk from the zero point of the load detection device 10 is obtained from the load value detected by the load detection device 10 in the vacant seat state after the collision, and the obtained deviation from the zero point of the load detection device 10 after the collision is obtained. By performing the zero point correction based on the amount of deviation, the accuracy of the zero point correction can be further improved and a correct occupant determination can be made, and the frequency of requesting vehicle inspections from dealers and repair shops can be reduced.

  As is clear from the above description, according to the vehicle seat device 100 according to the present embodiment, when a collision load value due to a collision of the vehicle M is detected, an error occurs in the detected load value of the load detection device 10 due to the collision. The deviation (Zs or Wsum) from the zero point due to the collision is obtained, and the obtained deviation (Zs or Wsum) from the zero point due to the collision of the load detection device 10 is calculated from the zero point of the load detection device 10 before the collision. It is replaced by adding to the deviation amount Zf0 or the like. Then, zero point correction is performed based on the displacement amount from the zero point of the replaced load detection device 10, and the load detected by the load detection device 10 is corrected by the zero point displacement amount correction unit 51. Therefore, in order to maintain the detection accuracy of the load detection device 10, it is possible to eliminate the trouble of frequently requesting a vehicle inspection to a dealer or a maintenance shop at every collision.

  Moreover, the passenger | crew's load which the load detection apparatus 10 detects is normally detected by the load of the compression direction used as the direction in which the upper rail 14L and the seat frame 111 approach. Therefore, by detecting the collision load with the load in the peeling direction opposite to the direction in which the passenger's load is detected, the collision load value appears prominently and can be detected easily and reliably.

  Further, since the deviation amount (Wsum) from the zero point due to the collision is detected from the relationship between the collision load stored in advance in the correspondence storage unit 58 and the deviation amount from the zero point, the deviation amount from the zero point due to the collision is detected. The load value that is obtained easily and quickly and detected by the load detection device 10 can be quickly corrected.

  When the vacant seat determination unit 53 determines that the seat is in the vacant seat state, the zero point shift amount detection unit 54 stores the data of the shift amount from the zero point of the load detection device 10 in the vacant seat state that has already been stored ( Zf0 etc.) is replaced with the load value Zk7 etc. detected by the load detection device 10 and stored as a deviation amount Zk from the zero point of the load detection device 10. In the present embodiment, the load detection device before the collision is calculated from the deviation amount Wsum from the zero point due to the collision of the load detection device 10 obtained from the relationship of the deviation amount from the zero point with respect to the collision load value stored in the correspondence relationship storage unit 58. The amount of displacement (Zf0 + Wsum) from the zero point of the load detection device 10 obtained by adding to the amount of displacement Zf0 from the zero point of 10 is the load value Zk7 detected by the load detection device 10 when the vacant seat determination is made. Replaced.

  As described above, the deviation amount Zk from the zero point of the load detection device 10 based on the load value actually detected by the load detection device 10 when the seat is empty is obtained by the correspondence between the collision load and the deviation amount from the zero point. Since the displacement amount (Zf0 + Wsum) from the zero point of the load detection device 10 is replaced and the load value detected by the load detection device 10 is corrected based on the displacement amount Zk from the zero point of the replaced load detection device 10, Even in the case, it is possible to execute accurate occupant determination based on the load value detected by the load detection device 10.

  Further, when the vehicle stop determination unit 50 determines that the vehicle M is in a stopped state (assuming that the vehicle M is vacant), the zero-point deviation amount storage unit 54 loads the load value detected by the load detection device 10. Since the deviation amount Zk from the zero point of the detection device 10 is stored, the disturbance due to the vehicle traveling that affects the detection accuracy of the deviation amount from the zero point is eliminated, and the deviation amount from the zero point of the load detection device 10 is reduced. Detection can be performed. Since the load value detected by the load detection device 10 is corrected based on the deviation amount Zk from the zero point of the load detection device 10 that is accurately detected excluding the disturbance as described above, the load detection device 10 can be used even after the collision. A highly accurate occupant determination can be executed based on the detected load value.

  In addition, the vehicle M that is determined to be vacant may not stop on a horizontal ground but may stop on an inclined ground. For example, when the load detection device 10 is disposed on the front and rear sides of the vehicle seat 11 (in the left seat, on the right side and on the front side) as in the present embodiment, the vehicle M is stopped so that the right side of the vehicle M is inclined downward. Then, the detection value of the load detection device 10 becomes larger than that of the flat ground without inclination, and conversely, when the vehicle stops with the left side of the vehicle inclined downward, the detection value of the load detection device 10 has no inclination. Smaller than flat ground. Since the amount of deviation from the zero point of the load detection device 10 is also obtained from the load value detected by the load detection device 10 in the empty seat state, it is affected by the inclination of the ground of the vehicle M that stops in the empty seat state.

  Therefore, the G sensor 43 detects the inclination angle of the inclined ground on which the vehicle M is stopped, and the zero point deviation detection unit 54 detects the load value detected by the load detection device 10. This is stored as a deviation amount Zk (for example, Zk7) from the zero point of the load detection device 10 corresponding to the inclination angle of the ground. Thus, not only when the vehicle M is stopped on the horizontal ground, but also in the vehicle M stopped on the inclined ground, the load detection device 10 corresponding to the inclination angle of the ground on which the vehicle M is stopped. Since the load amount detected by the load detection device 10 is corrected based on the accurately detected displacement amount Zk from the zero point of the load detection device 10, the load value detected by the load detection device 10 is corrected. A highly accurate occupant determination can be performed based on the load value detected by the detection device 10.

In the above-described embodiment, the collision load value is set to Lth1 or more. However, the present invention is not limited to this, and can be appropriately set by a test, an experiment, or the like according to the performance of the vehicle to be used or the load detection device.
Further, although Lth2 is set as the second collision load value, it is not always necessary, and it is sufficient that the first collision load value Lth1 is provided to detect the collision load.

  Further, load detection is performed by adding the deviation amount Zs from the zero point due to the collision of the load detection device 10 caused by the collision of the vehicle M to the value Zf stored as the deviation amount from the zero point of the load detection device 10 before the collision. In the case where the deviation amount Zk from the zero point of the device 10 is stored, it is expressed in the embodiment so as to be specifically added to be Zf + Zs = Zk. However, the present invention is not limited to this. When Zs includes the load of the vehicle seat, the value obtained by removing the load of the vehicle seat from Zs is added to the value Zf stored as the amount of deviation from the zero point of the load detection device 10 before the collision. This is a concept that includes a deviation amount Zk from the zero point of the detection device 10.

  In addition, an example has been described in which the front load sensor 21F and the rear load sensor 21R are disposed separately on the front and rear sides of the passenger wheel side of the left-hand drive vehicle. However, the front load detection unit and the rear load detection unit are the assistants of the right-hand drive vehicle. You may isolate and arrange before and behind inside the seat side. In addition, the front load detection unit and the rear load detection unit may be arranged separately in front of and behind the front passenger seat (close to the window).

  In addition, the load sensor may be disposed in two separate locations on the left and right of the rear part of the vehicle seat. In this case, the influence of the inclination of the vehicle is affected by the inclination of the vehicle in the front-rear direction, and when the front part of the vehicle is inclined to be lowered, the load is detected to be small and the vehicle front part is inclined to be high. In some cases, the load is detected large.

  In addition, the collision impact warning device is an indicator that informs the occupant of detection of a collision load that affects occupant determination. However, the present invention is not limited to this. For example, the operation of the airbag is stopped and the airbag is in a stopped state. It may be a warning display to notify that.

  Further, although the collision load is detected by the detection load in the separation direction in the load detection device, the present invention is not limited to this. For example, by the load in the compression direction that is the direction in which the attachment member and the seat-side fixing member approach each other. It may be detected.

  Thus, the specific configuration described in the above-described embodiment is merely an example of the present invention, and the present invention is not limited to such a specific configuration. Various embodiments can be adopted without departing from the scope.

  DESCRIPTION OF SYMBOLS 10 ... Load detection apparatus, 11 ... Vehicle seat (seat cushion), 14L ... Mounting member (upper rail), 21F ... Load detection apparatus (front load sensor), 21R ... Load detection apparatus (rear load sensor), 30 ... Control apparatus , 41L ... Mounting member (lower rail), 43 ... Inclination angle detection device (G sensor), 44 ... Zero point deviation amount detection unit (calculation unit), 48 ... Passenger determination unit, 49 ... Vehicle inclination calculation unit, 50 ... Vehicle stop Determining unit 51 ... 0 point deviation amount correcting unit 53 ... Vacant seat determining unit 54 ... 0 point deviation amount detecting unit (0 point deviation amount storage unit) 58 ... Corresponding relationship storage unit 100 ... Vehicle seat device 111 ... seat side fixing member (seat frame), Lth1 ... first collision load value, Lth2 ... second collision load value, M ... vehicle, Wsum ... deviation from zero point due to collision based on correspondence, Zf ... before collision 0 points Shift amount of al, the deviation amount from the zero point of Zk ... load detector (after collision), the amount of deviation from the zero point due Zs ... collision.

Claims (6)

A vehicle seat;
A mounting member provided on the floor of the vehicle;
A seat side fixing member for fixing the vehicle seat to the mounting member;
It is interposed between the seat-side fixing member and the mounting member, and is detected by the load acting on the vehicle seat and the collision of the vehicle in order to determine the presence / absence / type of an occupant and to determine the influence of a vehicle collision. A load detection device for measuring a collision load value ,
Said collision load value the load detection device is detect is, if the detection value between the preset first impact load value and the second collision load value, the load detection device caused by a collision of said vehicle The amount of deviation from the zero point due to the collision of the load is added to the value stored as the amount of deviation from the zero point of the load detection device before the collision, and stored as the amount of deviation from the zero point of the load detection device A deviation amount detection unit;
A zero point deviation correction unit that corrects the load detected by the load detection device based on a deviation amount from the zero point of the load detection device stored in the zero point deviation amount detection unit ;
The absolute value of the first collision load value and the second collision load value is set to a value smaller than the absolute value of the value at which a collision that cannot be corrected by the deviation from the zero point is detected. Sheet equipment. The vehicle seat device according to claim 1, wherein the collision load value detected by the vehicle collision by the load detection device is a load in a peeling direction in which the mounting member and the seat-side fixing member are separated from each other. . A correspondence relationship storage unit that preliminarily obtains and stores a relationship of a deviation amount from a zero point due to a collision with respect to the collision load value of the load detection device at the time of the collision of the vehicle;
The zero-point deviation amount detection unit detects a deviation amount from the zero point due to the collision of the load detection device based on a relationship between a deviation amount from the zero point due to the collision with respect to the collision load value stored in the correspondence relationship storage unit. The vehicle seat device according to claim 1 or 2. The vehicle seat includes a vacant seat determination unit that determines that the occupant is seated or vacant without any objects being placed,
The zero-point deviation amount detection unit uses the load value detected by the load detection device as the deviation amount from the zero point of the load detection device when the vacant seat determination unit determines that the vehicle seat is in an empty seat state. The vehicular seat device according to claim 3 which memorizes. A vehicle stop determination unit that determines that the vehicle is in a stopped state;
The zero-point deviation amount detection unit uses the load value detected by the load detection device when the vehicle stop determination unit determines that the vehicle is in a stopped state, and the deviation amount from the zero point of the load detection device. The vehicle seat device according to claim 4, stored as: A tilt angle detecting device for detecting a tilt angle of the vehicle when the vehicle is in a stopped state;
The vehicle seat device according to claim 5, wherein the zero-point deviation amount detection unit stores a deviation amount from the zero point of the load detection device according to the inclination angle of the vehicle detected by the inclination angle detection device. .

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